how laser printers work ?

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Understanding the principle of black and white laser printer is to understand the basis of color printing, you can use multiple images to illustrate the transformation process of its implementation. Bitmap original variable. Laser printers print the page bitmap bitmap to an image processor and then converted into electrical signals sent to the laser scanner unit. Rates "negative image" floating bitmap in the laser scanning unit, the page bitmap image points are converted into the transmission signal on the laser image drum, corresponding to a bitmap image for each pixel, a value pixel of the presence of the laser beam emitted without fireproof value.

 wireless printer

 wireless printer

 Lasing when the imaging drum for generating a light spot small, the image drum with a load in advance, the laser beam irradiation point is downloaded and not the metering is still in charge, through this process, the page bits contained in imaging drum becomes the charge of "negative image". Charge "negative image" of a toner "and" cartridge and imaging drum with the nature of the load, the rotation of the imaging drum, the charge roll "negative image" through images, the point to download will be absorbed by the toner charge, which is the discharge point is not absorbed as homosexual repel toner, so that the position of the "negative image" became a toner cartridge "ace". Cartridge "and" an image in a sheet of paper with the image transfer drum is also responsible of drum rotation through drum a transfer paper, the toner is adsorbed on paper as printed images. As the toner easily, printing paper through a heater to cartridge tightly adsorbed on the paper roll. As color laser printers use 4 color toner, so that the first charge on the "negative image" and toner "and" the formation of steps is repeated four times, each time on the adsorption of different colors of toner , an end product of the transfer roll is formed, a dark yellow green image, four colors. It is precisely because it is a color laser printer is repeated four times in steps, so that color printing is much slower than the speed of printing in black and white. The latest technology of color laser printing technology is called "time image".

 The key to this technology is the need for an LED laser is small enough, the light pipe in an existing location to put four colors corresponding to the four LEDs. Currently this technology is too expensive, so a "one-image" of the color laser printer, a normal user can afford, but there is no doubt that this is the future direction of development. TV, film synthesized by self-luminous colors, the composition law known as the principle of "additives", the three primary colors red, green secondary color blue as "white." Printing, coating is formed by the absorption of a certain color of light, so that the so-called "subtraction theory" law is tricolor, products, yellow green side as "black." Color laser printer color, end is how the synthesis of negotiation? HP technology as an example for analysis. technology HP Color Layering technology ImageRet2400 is used. Determine whether the basic printing 600dpi resolution images of resolution 600 dpi can be calculated, the distance between the centers of 42 micron pixel. HP 5 microns in diameter ultra-fine toner UltraPrecise, in fact, the results can be achieved 2400DPI, 2400DPI resolution when the central pixel spacing between about 10 microns . other words, if the end result is the pixel resolution of 600dpi color printing, then a pixel, you can use 16 × 16 blue, products, yellow and black toner particles with four blank to modulate pixel color because that the human eye can not distinguish the color of fine particles, so that the human eye to see the overall effect is, after mixing. This technology can provide the number of colors in the end, is calculated by permutation and mix in a classic example: A green products, colors, yellow, white and black packaging endless five bullets in five bottles China is now free to work off 16 balls in an empty bottle, the total will solve all possible outcomes? Calculate the theoretical value is ImageRet2400 technology to achieve the number of colors, depending on the constructor argument is that hundreds of thousands of people.

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